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Topic: Adiabatic


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  Adiabatic lapse rate - Wikipedia, the free encyclopedia
The Adiabatic lapse rate is the rate of temperature change that occurs in an atmosphere as a function of elevation, assuming that air behaves adiabatically.
The dry adiabatic lapse rate (DALR) is the rate at which a rising parcel of unsaturated air, such as a thermal, will lose temperature.
If the environmental lapse rate is between the moist and dry adiabatic lapse rates, the air is conditionally stable -- an unsaturated parcel of air does not have sufficient buoyancy to rise to the lifting condensation level, but once it gets there, it will gain buoyancy within the cloud.
en.wikipedia.org /wiki/Dry_adiabatic_lapse_rate   (957 words)

  
 GONMR Adiabatic Pulses
Adiabatic RF pulses have been used extensively in in vivo NMR for almost two decades, but have been considered by many NMR spectroscopists to be too long for application in high resolution NMR.
In contrast, during an adiabatic 90° or 180° pulse the RF vector rotates 90° or 180°.
We developed a new form of adiabatic mixing that spinlocks 100% of the initial magnetization at a frequency to the right of the 1H spectrum for the first half of the mixing period, and at a second frequency to the left of the 1H spectrum for the second half of the mixing time.
gonmr.com /Apulses.htm   (1081 words)

  
 Adiabatic process biography .ms   (Site not responding. Last check: 2007-10-21)
Another example is the adiabatic flame temperature, which is the temperature that would be achieved by a flame in the absence of heat loss to the surroundings.
Adiabatic heating and cooling are processes that commonly occur due to a change in the pressure of a gas.
The dry adiabatic lapse rate applies to air which is below its dew point, ie which is not saturated by water vapor, whereas the wet adiabatic lapse rate applies to air which has reached its dew point.
adiabatic.biography.ms   (906 words)

  
 Adiabatic Processes
An adiabatic process is one in which no heat is gained or lost by the system.
The first law of thermodynamics with Q=0 shows that all the change in internal energy is in the form of work done.
is a factor in determining the speed of sound in a gas and other adiabatic processes as well as this application to heat engines.
hyperphysics.phy-astr.gsu.edu /hbase/thermo/adiab.html   (352 words)

  
 [No title]
Kato proved an adiabatic theorem when the initial data lie in a subspace corresponding to an isolated eigenvalue of $H(0)$, provided that the corresponding subspace of $H(s)$ has constant multiplicity and was separated by a gap from the rest of the spectrum for all $s$.
The current status of the general adiabatic theorem is that, modulo technicalities, provided the initial data lie in a spectral subspace of $H(0)$ and the corresponding spectral subspace of $H(s)$ is separated by a gap from the rest of the spectrum for all $s$, the time evolution respects the spectral splitting in the adiabatic limit.
The adiabatic theorem is sometimes understood to be the statement that the adiabatic limit is approached exponentially fast for all times that lie outside the support of $\dot H(s)$.
www.ma.utexas.edu /mp_arc/papers/98-370   (2997 words)

  
 Adiabatic Processes
This is called adiabatic heating and cooling, and the term adiabatic implies a change in temperature of the parcel of air without gain or loss of heat from outside the air parcel.
Adiabatic processes are very important in the atmosphere, and adiabatic cooling of rising air is the dominant cause of cloud formation.
This is called the Saturated adiabatic lapse rate (or the wet adiabatic lapse rate, or the moist adiabatic lapse rate, depending on the textbook you are using).
daphne.palomar.edu /jthorngren/adiabatic_processes.htm   (1264 words)

  
 TechnologyWorld05 | a world of technology opportunities
Adiabatic Logic’s mission is to become the World Leader in the application of micro and nano scale energy re-cycling techniques to electronic system design and integration.
Adiabatic Logic is seeking collaborative partners / investors to help further develop both the existing technology and new technology using the energy re-cycling principles.
Adiabatic Logic is seeking discussions with semiconductor/electronics manufacturers that would benefit from reducing the power consumption of their products.
www.technologyworld05.com /ExhibitorInfo.asp?StandID=7   (436 words)

  
 Expert About ad:Adiabatic
In September 2004, Adiabatic Logic received an Exceptional Research and Development Grant of £500,000 from the UK Department of Trade and Industry (DTI) and is now looking to raise an additional £1.
Among those stands the adiabatic variablemethod; we present in this paper a mathematical analysis of thisapproximation and propose, in particular, an a posteriori estimate thatmight allow for verifying the adiabaticity hypothesis that is done on somevariables; numerical simulations that support the a posteriori estimatorsobtained theoretically are also presented.
However, the concepts behind Adiabatic styles are still valid and by forfeiting the asymptotically zero power dissipation, it may be possible to bring performance and complexity closer to conventional logic while still maintaining some of the energy advantage.
expertsite.biz /dir/ad/adiabatic.2.htm   (1787 words)

  
 Low-Power Digital Systems Based on Adiabatic-Switching Principles   (Site not responding. Last check: 2007-10-21)
Adiabatic switching is an approach to low-power digital circuits that differs fundamentally from other practical low-power techniques.
When adiabatic switching is used, the signal energies stored on circuit capacitances may be recycled instead of dissipated as heat.
The dissipation of the adiabatic amplifier is compared to that of conventional switching circuits, both for the case of a fixed voltage swing and the case when the voltage swing can be scaled to reduce power dissipation.
www.isi.edu /acmos/abstracts/94-12.XonVLSI.html   (143 words)

  
 Adiabatic Switching Principles
Not that adiabatic circuits would dissipate more power than conventional logic, but that saving in power is not much as compared to the loss in terms of area, complexity of design and difficulty in managing the two rails.
Reversible logic is an important requirement because for complete adiabatic functioning of a sequential circuit would require the outputs of the next stage to control the inputs of the previous stage.
Adiabatic logic can be used at places where the load capacitance is large as most of the circuit power is dissipated in such areas and efforts put in adiabatic circuit design at these places is fully justified and profitable.
www.geocities.com /anujgrover22/techpapers/adiabatic.html   (709 words)

  
 The adiabatic atmosphere
The explanation for this discrepancy is the presence of water vapour in the atmosphere.
On the other hand, if the atmospheric lapse rate exceeds the adiabatic value then, after rising a little way, the packet will be less dense than its immediate surroundings, and will, therefore, continue to rise due to buoyancy effects.
Occasionally, however, the lapse rate exceeds the adiabatic value, and this is always associated with extremely disturbed weather patterns.
farside.ph.utexas.edu /teaching/sm1/lectures/node56.html   (1229 words)

  
 mca-adiabatic   (Site not responding. Last check: 2007-10-21)
In its most basic form it is a statement about energy transfer, and it says that it takes time for energy to be transferred from one system to another; therefore the faster something happens, the less energy is transferred.
Moreover, and this goes beyond and adds to the separability of timescales guaranteed by the adiabatic principle, we are buffered from fast, small-scale events, like ionization of individual atoms in our bodies or even errors in gene transcription, by longer term regulatory and self-correcting processes typical of the intermediate scales of autopoietic or self-organizing systems.
The adiabatic principle has exceptions, and one of these is fundamental to human social organization.
www-personal.umich.edu /~jaylemke/webs/time/mca-adiabatic.htm   (485 words)

  
 GONMR Mike Garwood
Dr Garwood is a leading expert on adiabatic pulses with many publications describing principles and applications and he is listed as a co-inventor of three adiabatic pulse patents.
He is frequently invited to lecture on adiabatic pulses in other NMR laboratories and teaches adiabatic pulse principles at the yearly meetings of the International Society of Magnetic Resonance in Medicine.
In the process of optimizing adiabatic pulses it became apparent to him that these exotic pulses could also be used to automate high resolution NMR.
gonmr.com /mg.htm   (300 words)

  
 adiabatic cooling and clouds   (Site not responding. Last check: 2007-10-21)
This is an instruction on the adiabatic cooling process and different types of clouds.
Adiabatic cooling deals with the cooling of parcels of air as they rise, or are forced up, through the atmosphere.
The best illustration of adiabatic cooling is as a parcel of air is being forced over a land formation, such as a mountain.
ellerbruch.nmu.edu /cs255/mboutell/cloudadiabatic.html   (219 words)

  
 Disaster Advice Disaster Advice Glossary Adiabatic   (Site not responding. Last check: 2007-10-21)
Adiabatic processes, though hardly realized in practice by a water damage or restorative drying technician, are often considered in thermodynamic reasoning.
The adiabatic process during which the air involved in non-effected areas (the parcels of air remaining unsaturated during the drying process) are relatively simple and they do not effect the humidified air parcel directly.
The adiabatic exchange of heat between air and a water spray or a wetted surface.
www.disasteradvice.co.uk /Glossary/Term/Adiabatic   (746 words)

  
 The shock adiabatic   (Site not responding. Last check: 2007-10-21)
It must be emphasized that the adiabatics are not identical, as would happen for Poisson adiabatics through a given point.
This is a consequence of the fact that the equation of the shock adiabatic cannot be written in the form
The Poisson adiabatics for a given gas form a one parameter family of curves, but the shock adiabatic is determined by two parameters, the initial values
astron.berkeley.edu /~jrg/ay202/node177.html   (823 words)

  
 True Single Phase Adiabatic Multiplier
This page highlights the 8-bit adiabatic multiplier that won First Prize in the VLSI Design Contest (Operational Category) of the 38th Design Automation Conference.
Adiabatic circuitry presents a promising alternative to this approach.
The main idea behind adiabatic design is to transfer charge between circuit capacitors and a time-varying power-clock node.
www.eecs.umich.edu /acal/adiabatic   (613 words)

  
 Charge Recovery and Adiabatic Switching Techniques in Digital Logic   (Site not responding. Last check: 2007-10-21)
Although these styles do offer the benefit of simplicity and ease of design, they are not truly adiabatic, owing to the nonzero turn-on voltages of the diodes and transistors involved.
We intend to explore the issues of adiabatic clock generation and distribution, in particular, the feasibility of some form of on-chip clock buffering (such as moving Svenson and Koller's stepwise charging on-chip).
We also intend to investigate the interaction between clock-generation issues and their impact on the inverse speed/energy trade-off of adiabatic logic styles.
kabuki.eecs.berkeley.edu /~luns/papers/241rep.html   (1658 words)

  
 non-adiabatic transitions, outline
It may, however, be violated when the energy splitting between adiabatic PESs are comparable to or smaller than the corresponding non-adiabatic couplings, and, therefore, the latter cannot be accounted perturbatively.
However, the separate consideration of adiabatic dynamics and non-adiabatic transitions is of limited use for reactions in condensed phase.
First, in the case of a multidimensional reaction coordinate the extent of the non-adiabaticity region may sometimes be difficult to determine.
www.mpibpc.gwdg.de /groups/troe/neufeld/outline2.html   (993 words)

  
 Adiabatic Expansion Cooling of Gases
Using simple adiabatic expansion, the ratio of the constant pressure to constant volume heat capacities of gases will be measured.
The change is approximately adiabatic only because it is rapid copared to heat flow but slow on the scale of the mechanical work.
No appreciable amount of heat is transferred between the reservoir and the gas in the carboy during the short period of the expansion, but after the stopper is replaced, the temperature is seen to increase as thermal equilibrium is reestablished for the gas remaining in the vessel.
www.chem.ufl.edu /~itl/4411L_f00/gamma/gamma.html   (1528 words)

  
 Adiabatic Switching   (Site not responding. Last check: 2007-10-21)
To reduce the dissipated energy, only methods that reduce the load capacitances or the supply voltage can be applied [6], but in any case they are definitely limited by the equation 1.
The energy transfer processes can be done adiabatically if, during the rising (falling) transition, the power supply delivers (recover) the charge to (from) the load at a potential arbitrarily close to the output potential.
partially adiabatic circuits: as 2N-2N2P and bootstrap logic, in which some energy is recovered, but there are some looses due to irreversible operations [12,13,14].
www-cad.eecs.berkeley.edu /~aferrari/classes/ee241/adiabatic/report-mid/node2.html   (454 words)

  
 adiabatic process --  Encyclopædia Britannica
A rapid expansion or contraction of a gas is very nearly adiabatic.
Adiabatic processes are characterized by an increase in entropy, or degree...
Another special idealized model process that occurs frequently in both system analysis and control volume analysis is the isentropic (reversible and adiabatic) process for an ideal gas having a constant specific heat.
www.britannica.com /eb/article-9003732?tocId=9003732   (885 words)

  
 The second adiabatic invariant
We have seen that there is an adiabatic invariant associated with the periodic gyration of a charged particle around magnetic field-lines.
Thus, it is reasonable to suppose that there is a second adiabatic invariant associated with the periodic bouncing motion of a particle trapped between two mirror points on a magnetic field-line.
In other words, the second invariant is proportional to the loop integral of the parallel (to the magnetic field) velocity taken over a bounce orbit.
farside.ph.utexas.edu /teaching/plasma/lectures/node24.html   (551 words)

  
 Adiabatic (Gerald L. Hurst)
I think a concise definition of an adiabatic process is q=0, that >is, there is no net transfer of heat from the system in question and its >environment.
Radiation losses are generally trivial and the rapid, spherical expansion of the gas cloud at ca 300 M/S or better hardly provides much time for the exchange of heat at the air interface.
If terms like "adiabatic" and "ideal" offend our academic and puritan sensibilities, we can always resort to the use of suitable limiting adverbs to advise the world that our map is merely a map and not the terrirory.
yarchive.net /explosives/adiabatic.html   (582 words)

  
 Moist Adiabatic Concept Model
The Moist Adiabatic concept model allows you to explore the relationship between rising motion, condensation and temperature.
We recommend that you go through the Condensation and the Dry Adiabatic concept models to gain an understanding of the processes within the models.
In the dry adiabatic tool, you described how the temperature changed as a parcel of air rises.
www.dpc.ucar.edu /vgee/moistadiabatic.htm   (912 words)

  
 Citebase - Adiabatic Theorem without a Gap Condition
Adiabatic quantum computation has recently attracted attention in the physics and computer science communities, but its computational power was unknown.
We define the adiabatic limit of an open quantum system as the regime in which its dynamical superoperator can be decomposed in terms of independently evolving Jordan blocks.
We prove an adiabatic theorem for the ground state of the Dicke model in a slowly rotating magnetic field and show that for weak electron-photon coupling, the adiabatic time scale is close to the time scale of the corresponding two level system--without the quantized radiation field.
citebase.eprints.org /cgi-bin/citations?archiveID=oai:arXiv.org:math-ph/9805022   (1434 words)

  
 Adiabatic Compressibility, Adiabatic Expansion
Sir Isaac Newton assumed that the speed of sound was an isothermal process and used the parameter defined by Equation 1 to calculate the speed of sound in a gas.
We can calculate the adiabatic compressibility in terms of quantities that we already know (using the Euler cyclic rule twice, once the normal way and once in reverse).
Early in the course we derived the equation for the adiabatic expansion of an ideal gas,
www.chem.arizona.edu /~salzmanr/480a/480ants/kapsadex/kapsadex.html   (482 words)

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